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JHS 3 Series Harmonic Trem — Like New, Full KitSelling my JHS 3 Series Harmonic Trem in essentially brand new condition. Original box and all inserts included. Barely touched.In 1960, Leo Fender introduced a circuit in his Bandmaster and Vibrasonic amps called the “Harmonic Tremolo” — the amp’s signal was split into high and low frequency components, with the output switching back and forth between the two, producing a dreamy effect similar to the Uni-Vibe. This pedal brings that classic vibe to a compact, pedalboard-friendly format.Toggle up gives you a great-sounding standard amp tremolo, while toggle down delivers the full harmonic trem effect. Three knobs keep it dead simple to dial in, whether you want a subtle pulse or something more hypnotic and swirling.Runs on 9V DC negative center power, 65mA. Made by JHS in Kansas City, MO.No trades. Ships well-packed. Happy to answer any questions!